这是我对 jQuery 的看法。解决方案并不通用，这意味着必须根据实际设计调整一些位置和内容。
基本上我所做的是：在触发器上克隆/删除整个背景（应该模糊的内容）到具有未模糊内容的容器（如果不是全宽，则可以选择隐藏溢出）并将其正确定位。需要注意的是，在调整窗口大小时，模糊的 div 会在位置方面与原始 div 不匹配，但这可以通过一些调整窗口大小的功能来解决（老实说，我现在对此不屑一顾）。
非常感谢您对此解决方案的意见！
谢谢
这里是fiddle，未在 IE 中测试。
HTML
<div class="slide-up">
<div class="slide-wrapper">
<div class="slide-background"></div>
<div class="blured"></div>
<div class="slide-content">
<h2>Pop up title</h2>
<p>Pretty neat!</p>
</div>
</div>
</div>
<div class="wrapper">
<div class="content">
<h1>Some title</h1>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque molestie magna elit, quis pulvinar lectus gravida sit amet. Phasellus lacinia massa et metus blandit fermentum. Cras euismod gravida scelerisque. Fusce molestie ligula diam, non porta ipsum faucibus sed. Nam interdum dui at fringilla laoreet. Donec sit amet est eu eros suscipit commodo eget vitae velit.</p>
</div> <a class="trigger" href="#">trigger slide</a>
</div>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg">
<filter id="blur">
<feGaussianBlur stdDeviation="3" />
</filter>
</svg>
CSS
body {
margin: 0;
padding: 0;
font-family:'Verdana', sans-serif;
color: #fff;
}
.wrapper {
position: relative;
height: 100%;
overflow: hidden;
z-index: 100;
background: #CD535B;
}
img {
width: 100%;
height: auto;
}
.blured {
top: 0;
height: 0;
-webkit-filter: blur(3px);
-moz-filter: blur(3px);
-ms-filter: blur(3px);
filter: blur(3px);
filter: url(#blur);
filter:progid:DXImageTransform.Microsoft.Blur(PixelRadius='3');
position: absolute;
z-index: 1000;
}
.blured .wrapper {
position: absolute;
width: inherit;
}
.content {
width: 300px;
margin: 0 auto;
}
.slide-up {
top:10px;
position: absolute;
width: 100%;
z-index: 2000;
display: none;
height: auto;
overflow: hidden;
}
.slide-wrapper {
width: 200px;
margin: 0 auto;
position: relative;
border: 1px solid #fff;
overflow: hidden;
}
.slide-content {
z-index: 2222;
position: relative;
text-align: center;
color: #333333;
}
.slide-background {
position: absolute;
top: 0;
width: 100%;
height: 100%;
background-color: #fff;
z-index: 1500;
opacity: 0.5;
}
jQuery
// first just grab some pixels we will use to correctly position the blured element
var height = $('.slide-up').outerHeight();
var slide_top = parseInt($('.slide-up').css('top'), 10);
$wrapper_width = $('body > .wrapper').css("width");
$('.blured').css("width", $wrapper_width);
$('.trigger').click(function () {
if ($(this).hasClass('triggered')) { // sliding up
$('.blured').animate({
height: '0px',
background: background
}, 1000, function () {
$('.blured .wrapper').remove();
});
$('.slide-up').slideUp(700);
$(this).removeClass('triggered');
} else { // sliding down
$('.wrapper').clone().appendTo('.blured');
$('.slide-up').slideDown(1000);
$offset = $('.slide-wrapper').offset();
$('.blured').animate({
height: $offset.top + height + slide_top + 'px'
}, 700);
$('.blured .wrapper').animate({
left: -$offset.left,
top: -$offset.top
}, 100);
$(this).addClass('triggered');
}
});